[MCJIT] Rewrite RuntimeDyldMachO and its derived classes to use the 'Offset'
field of RelocationValueRef, rather than the 'Addend' field.

This is consistent with RuntimeDyldELF's use of RelocationValueRef, and more
consistent with the semantics of the data being stored (the offset from the
start of a section or symbol).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217328 91177308-0d34-0410-b5e6-96231b3b80d8
[MCJIT] Revert partial RuntimeDyldELF cleanup that was prematurely committed in
r217328.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217329 91177308-0d34-0410-b5e6-96231b3b80d8